Water-tube boiler.



PATENTED JAN. 17, 1905.

K. HELLNER.

WATER TUBE BOILER.

APPLIOATIOH FILED mm: 22, 19M.

NlTE STATES Patented January l'l 1905 PATENT OFFICE.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 780,177, dated January 17, 1905. Application filed June 22, 1904,. SerialNo. 213,724.

To all whont it may concern.-

Be it known that I, KARL HELLNER, a subject of the King of Sweden and Norway, residing at Wermbohl, Katrineholm, Sweden, have invented certain new and useful Improvements in ater-Tube Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The present invention relates to devices for fastening the tubes and closing the ends there of in steam-boilers provided with one waterchamber, wherein the tubes, as known, are arranged in pairs within each other, each pair comprising an outer boiler-tube and a circulation-tube inserted in same. The inven tion has for object that the tubes may easily be removed and cleaned.

In the accompanying drawings, Figure 1 shows a vertical longitudinal section of one part of the water-chamber with an arrangement for securing the tubes thereto. Fig. 2 is a front view of a part of the WELlJGF-ClltIlIh ber. Fig. 3 shows same part in cross-section on the line A B, Figs. 1, 1, 5. Fig. I shows the'same in cross-section on the line C D. Fig. 5 shows a vertical longitudinal section of one part of the water-chamber provided with another arrangement for fastening the tubes and an arrangement for closing the ends thereof. Fig. 6 shows the same arrangement in plan section. Fig. 7 shows the same arrangement in section on the line A B, and Fig. 8 on the line C D. Fig. 9 is a rear elevation of a set of tubes with the end cover re moved.

The front end of the boiler-tube a or a, Figs. 1, 5, and 6, is secured to the inner wall (2 of the water-chamber in such a way that in an enlargement of said end of the tube a or c is inserted a cylinder IL or k, the inner end of which is provided with a collar it", suitably threaded, and somewhat apart from this collar the cylinder it or it is provided with a collar [1/ The cylinder lb or ii is inserted into the tube a or a while this latter is heated and is thus shrunk on when the tube is cooling. In order still further to secure the fastening of the cylinder it or it in the tube a or a, this latter is provided with a restriction it" between the collars if and [65. The front end ofthe tube (2 or a. is somewhat conical on its outside and enters into an opening in the wall 44, being conical in a corresponding way. Between this last-mentioned end of the tube a or a and the cylinder it or It there is left a space, as illustrated on the drawings. The cylinder h or 72/ passes through the opening in the wall a, and on the end of the cylinder /1 or it projecting inside the wall a and threaded a screw-nut i, Fig. 1, is fastened, which pressing against the inside of the wall 0, forces the cylinder /2, and the tube a forward, thereby pressing the front end of this latter into the opening of the wall a.

The circulation-tube 7), Fig. 1, is at the front end pressed or screwed into a conical flange in, Figs. 1, 3, which is inserted into the parti tion d of the chamber. This flange is provided with twol1ook-sl1aped clamps Z, Figs. 1, 3, diametrically opposite each other, provided each with a screw-nut, by means of which the flange Z: is secured to the partition d, thereby keeping the tube b rigidly and in central position in the boiling-tube a. By this arrangement it will be an easy thing to remove and insert the tube 6, and an absolute tightening between the two rooms of the water-chamber is obtained.

The tightening of the screw-nut i' on the boiler-tube a by means of a suitable key engaging recesses m in the screw-nut '21, Figs. 1, 4, as well as the introduction and fastening of the inner tube 7), is effected through the opening in the front wall 0 just opposite. This opening is suitably conical on its inside and is closed by means of a cover a, Figs. 1, 52, inserted therein and conical in corresponding way. The cover is fastened by means of the clamp 0 and the nut 12 in usual way. Still an arrangement for fastening the tube in the water-chamber more easily attainable from the outside consists therein that the cylinder h, Figs. 5, 6, through the chamber 9 and opening in partition (Z and is in the chamberfprovided with two laps 7L2, Figs. 5, 6, and 7, diametrically arranged. The clamp 0, securing the outer cover 72, Figs. 5, 6, is in this form extended, so as to enter with its two arms into the corresponding openings in the two laps 72,2 of the cylinder 7i, Figs. 5, 6, and 7, whereby by tightening the outer screw-nut the boilertube a, as well as the cover a, is pressed in and secured.

The cylinder it is around its periphery provided with passages if, Figs. 5, 6, and 8, leading into the inner chamber g of the waterchamber and serving as outlet for the upward circulating stream in the boiler passing from the boiler-tubes.

The circulation-tube 6, Figs. 5, 6, is at its front end funnel-shaped, lying with the outer edge of the funnel close to the inner surface of the cylinder /i, just opposite the partition (Z of the chamber. The cylinder is somewhat enlarged at this partition in order to form a supporting edge, preventing the tube Z) from being moved inward in the tube a, while the arms of the clamp 0 prevent outward movement. The tube 5 is further at its inner end provided with yielding outbent laps 6 Figs. 5, 6, resting against the inside of the tube (4, thus, together with the funnel at the opposite end in the way illustrated on the drawings, keeping the tube 1) in central position in the tube a. The funnelshaped inlet for the downward circulation from the chamber f in the tube 6 is of course very favorable for such circulation.

The arrangement for closing the rear end of the boiler-tube a or a is also based upon the above arrangement for fastening the front end of the tube a or a Thus there is at the rear end of the boiler-tube a or a inserted a cylinder q, Figs. 5, 6, in the way above mentioned regarding the cylinder 71 or /t' at the front end of the tube, said cylinder (I being, however, not long enough to project outside the end of the tube. It is not necessary in this case to enlarge the tube end; but the tube can be of usual size, the cylinder (1 being of course made smaller in relation thereto. According to the same arrangement the tube end is also somewhat conical on its outside and is closed by means of a cover r, the inside of which is conical and fitted around the tube end, Figs. 5, 6. For fastening the cover on the tube end there is a cross-piece 8, Figs. 5, 6, 9, which, by means of its two arms .9 8 Fig. 5, enters into corresponding openings or holes Q2 in the cylinder q, Fig. 5, the one of said holes being greater than the other one, (1, thereby permitting the swinging of the cross-piece 8 into the opening q, so that the same can easily be inserted and removed from the tube a or passing through the cover r, Figs. 5, 6, and on its outside provided with the nut tfor tightening the cover 0*, thus effecting an absolute tightening of the tube a or (0'. According to said arrangement the'inside of the boiler-tubes can easily be cleansed, &c., from the rear end of the steam-boiler without removing the tubes.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. In a water-tube boiler, a boiler-head, a boiler-tube having a tapering end portion adapted to fit an opening in thewall of the boiler-head, a cylinder secured within said tube'so as to form an annular space between the inner face of the tapering portion and the periphery of the cylinder, and means for securing the cylinder in said head.

2. .In a water-tube boiler, a boiler-head, a boiler-tube having a tapering end portion adapted to project into an inwardly-converging opening in the inner wall of the boilerhead, a cylinder secured to said tube behind said tapering portion and forming an annular space between the inner circumference of the end of the tube and the periphery of a portion of the cylinder, and means connected to the cylinder for securing it in said boiler-head.

3. In a water-tube boiler, a boiler-head, a boiler-tube having a tapering end portion, an internal rib formed on said end portion, a cylinder in said tube adapted to form an annular space between its periphery and the inner circumference of the tube, a collar on the cylinder in rear of said rib, and means connected to said cylinder to seat the tapering portion in a converging opening in the wall of the boiler head.

4. In a water-tube boiler, a boiler-head, a partition therein forming an inner and outer chamber, a boiler-tube having a tapering end portion adapted to fit a beveled opening in the wall of the boiler-head, an internal rib formed on said end portion, a perforated cylinder in said tube, a collar on the periphery of said cylinder on each side of said rib, a circulationtube in the boiler-tube, means on the circulation-tube for closing one end of the cylinder, and means for tightening the end of the boilertube in the boiler-head.

5. In a water-tube boiler, a boiler-head having inwardly converging openings formed therein, a partition in said head forming an inner and outer chamber, a boiler-tube having an end portion tapering to conform to the openings, a cylinder connected to said tube so as to form an annular space between its periphery and the inner circumference of the tube and provided with perforations connecting with the inner chamber, a circulation-tube in the boiler-tube communicating with the outer chamber, means in the cylinder to preis extended, so as to pass I a. The cross-pieces is formedlwith a screw 5 vent the inward movement of the circulationmy invention I have signed my name in prestube, a cover seated in anlinvgacil'dly-clonvergence of two subscribing Witnesses. ing opening in tie boilerlea irect y oppo- 1 n site each of the aforesaid openings, means con- KARL HELLNLR 5 necting the cover and cylinder and means for Witnesses:

adjusting said connection. KONR. DAHLQVIST,

In testimony that I claim the foregoing as HARRY FREDR. ALBII'IN. 

